It would be great if you guys could do both :) but if you just do one plsss tell me what one you did! I will give brainiest if you do both

-2x

Step-by-step explanation:

If you combine the like terms than it is 4-6 which equals -2.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

it would be a on edgenuit y

the diagram below is your final answer